The story behind the ban on red-yolk duck eggs in China

Health officials in China recently banned the sale of red-yolk duck eggs, as they were found to contain a carcinogenic substance called ‘Sudan IV’. Farmers in Hebei province have been feeding their ducks with a carcinogenic substance to make the yolk of the egg, red. Red-yolk eggs were very famous in the Chinese capital and they cost more because they were believed to be healthier than normal duck eggs. This video explains how the farmers in Hebei used a dye to change the color to the yolk.